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Expose memory metrics in Performance Bar

We've had per-transaction memory metrics in application logs for a while now:

  • mem_bytes: Bytes allocated
  • mem_mallocs: Number of calls to malloc
  • mem_objects: Number of Ruby objects allocated

These already appear in ELK logs. We should also make these visible in the Performance Bar, where they have increased visibility and which is more easily accessible.

Edited by Matthias Käppler